The PCM controlled lamps are intended to alert the driver
to an operating condition which may require immediate attention.
The Engine Oil Level Sensor is used to detect low engine oil level conditions.
PCM Controlled Lamps
The instrument panel indicators ignition 1 feed powers the PCM controlled
lamps. The PCM controlled lamps operate as follows:
| • | Hot Lamp, the PCM commands the Hot lamp ON when the engine coolant
temperature exceeds 124°C (255°F). The PCM commands the Hot lamp OFF
when the engine coolant temperature falls below 120°C (248°F). |
| • | Generator Lamp the PCM commands the generator lamp ON under the
following conditions |
| - | When the engine speed is greater than 1200 RPM and system
voltage falls below 10 volts for longer than 10 seconds. The
PCM commands the generator ON when system voltage rises to above 12 volts. |
| - | When the generator control circuit (L terminal) remains low for
longer than 10 seconds. |
| - | When the engine speed is below 2000 RPM and the generator
PWM control circuit (F terminal) duty cycle remains low for longer than 20 seconds. |
| - | When the engine speed is above 4000 RPM and the generator
PWM control circuit (F terminal) duty cycle remains high for longer than 20 seconds. |
| • | Low Oil Level Lamp: The PCM commands the Low Oil Level Lamp ON
if the Engine Oil Level sensor indicates that a low oil level condition exists.
The PCM determines whether or not to test for low oil level based on the difference
between engine coolant temperature at the last shutdown and engine coolant
temperature at startup. This is to ensure that the oil has drained back into
the oil pan before testing. |
